Telephone-exchange system



wil...

W. C. WEAVER. TELEPHONE EXCHANGE SYSTEM. APPLICATION FILED Dsc. 27. |918.

Patented Dec. 12, 1922.

by- MMA/Vy.

Bec.

in Wirf:

ELECTRIC GJEPANY, NCGRPOR F 'NEW i ,Application filed Deceinioci'` 2?', 1G16. Serial No. 268,444.

To all whom it may concern: y Be it known thatl, WHL-Lian C. minivan, a citizen of the United tates. residing at East Or-ange, in t-he county of Essex, State oit New Jersey, have invented certain new and useiul linpioveinents in Telephone-iti;- chanogc Systems7 of which the following ii'iill, clear, concise, and exact deseriirition.` rllhis invention relates tortelephone ex! change systemsg and kinore particularly `to such systeins in which the successive ance of a plurality oit operators is requirec in establishing a connection between two telephone lines.

lt is 'frequently thepractice especially in toll oi' long` distance telephone systems7 tor one operator upon answering` a call over a trunkcircuit associated with a culling` line7 to obtain certa-in information, and 'furnish such information to another operator, who thereupon connects with the trunk and coinA pletes the connection with the cailed line or refers the inatter to another operator who is able to complete the connection.

ln systems of this character, itis essential th't each operator receive a positive accurate indication when a succeedingopei'ator establishes a connection with the calling line so that the previous connection therewith may he discontinued. f it is an object of this invention to provide a siinple and inexpensive systeinfoit this na ture which7 while providing 'a reliable dis-, connect signal 'for an operator when theresponsihility ot the call has heen assumed hy the succeeding; operaton irrespective of the character oi? thelink circuit employed toration to norinal ot also insures the res all apparatus in the link circuit upon the` from the line disconnection oi such circuit circuit. v

lin order to attain this object, `in accordance with one feature oit the invention. a link circuit employed by an operatorftcr connection with the trunkcircuit associated. with a calling;` line provided with a dit ierentially wound relayVthe normally aidino; windin ot which are placed in anopposing; relation within a local circuit upon the opening ot the operating circuit thereby insuring the iniinediate release of such relay.

'1t istliought that the inventioninaywhe thoroughly understood from the following specication 'and the` annexed drawing, in which is shown one embodiment ofv the inof the s the rele `nected in any well-known niannerwithA the vention as applied to an operators link circuit.

in the drawing an ordinary suhscribers ine circuit :i is connected in any wellinowninanner at' a central oilicel with a :1r ink circuit B terminating in njuiltiple 'acks 1 2 and 3, appearing' at various operatori positions X, Y andZ9 respectively, itchhoard at the central oiiice.` At s and Z siinilar operators link circu. and D respectively embodying the invention are provided to enable the operators thereat to secure connection with the trunk circuit B. At position X, suiiicient portions are shown ot an ordinary con necting or link circuit C which may loe of any usual type employed for connecting the called line circuit (not shown) with the tii'lnk circuit B. Relays 9, 12, 13- and l5 otlinl' circuit D, `and relays 109, 112, 113 and 115 oi link circuit D, cooperate to cont-rol the disconnect signal lamps 18 and liti respectiwely7 the windings-ot marginal li and 109% which are connected in netically aiding' relationship uponthe nection oi the associated plug with the spending; jack of thetrunk oircuitB being changed to a magnetically opposi' g; relationship upon the disconnection of the associatedy plug troni vthe corresponding jack oztithe trunk circuit thereby aiding e oi the relay. in order to indicate that ylays 12 and 112 are slow toop crut thedi'awine` shows arrows intersecting the ari-natures `or such relays `and arrows pointing in the direction in which the arina- .tures move slowly. l lt is thought that the inventionwill he more `-tally cmnprehended from the follow# .ioni description of the operation of the sys- `teni illustrated hy the drawinfig'.Y i

Assuming; that a call initiated at.the subsorihers station on the line A. in the usual inanncr has been answereda and the line contrunk circuit li? then the operator at position who` may be the recording or other toll operator, upon being notified over a call circuit orin seine other suitable manner, that thecallingline is connected with the trunk circuitBg inserts the plug 7 of the operators link circuit D into jack 3. Relay 9 operates overa circuitestahlishediroin battery through the winding 8 Ot relay 9, the sleeve contacts or" plug 7 and jack 3 and resistance L1 to ground. Relay 11 thereupon operates over a circuit extending from battery through the winding,` of relay 11, and the conta'ot'of' relay 9 to ground. rlie opening` of the upper normal Contact of relay 11 disconnects the testing conductor .of the operators telephone set from the tip contact of plug,1 7, and the closure of the upper alternate contact thereof completes the con* tinuity of the tip conductor to the listeningl key 19. The closure of the lower alternate Contact of relay 11 Connects the winding' or" inarginal'relay 18 vto Lground, which', hows over, does the vsleeve circuit to operate. Slow operating relay 12foperates over a Circuit est` l lished from battery through the winding` `relayf12, the Contact of relay 18, Contact 1 and the lower alternate Contact of relay 11 to ground. A eirouit is thereupon lcornpleted from batter-y through windings 14 and 16, in series, of relay 15 the righthand alternate Contact of relay 12' to ground. VBy theoperation oi' relay 12, the circuit of a llheatstone bridge is completed, the `arms of which are the windings 141 and 16 off relay 15, theres'stanoe fl, and the winding of i'elay 9. ln the galvanorneter eireuit is connected \\`*inding 10 of relay 9. Grounded battery is conn eted. to thejunction `oi arms 1.1 and 8,"and jr uind kto the junctionsof l .and 16.

Relayl isdifferentially.connected l. does not operateunder these conditions, the current flows, through winding 10 sueha direction thatt ieenergizin'gr eeet suoli y'vinding 'aids'that of windingv 8 in maintaining relay 9 in an operated condition. rllhe actuation of listening key 19 conl-r neots Vthe operators telephone set (not shown) withV the link circuit Conductors in the usual manner and through the trunk cire-uit 'Bjwitli the `line 'Circuit A thereby enablingl the operatorto Converse with the callinfgparty.

It the operator at position has obtained i sufficient information, the connecting operator at position X may be notified over call c ircuit or lin any other suitable manner, andthe call maybe completed by the latter operator. However, the call may be referred'by the voperator at position Z to another operator1 suoli the operator at positionY, lor further information.

- In the latter oasev the operator at'position Y, in responseto such notification, inserts plug 107 OT'.' link circuit Dy into jack 2 of trunk oireuit B, thereupon operating' relay 109 over a circuit established troni battery rthrough windinpglOS of relay 109, and the sleey-e'contacts of plug 107 and jack 2 to the sleeve conductor of" the 'trunk circuit B where itv joins'the circuit preyiously'traced, including'the winding 8 "of i'elayQ. rRelay lll also operates yover a circuit' established notl obtain suoient current 'ironiiiowinlo,` through windings from battery through the winding of relay 111 and the Contact of relay 109 to ground. lilarginal relay 113, which is similar to relay 13 of link circuit D and corresponds thereto, energized in this circuit with suliioient current for operation. Due to the slow operating `character ot' relay 112, relay if' voperates over a circuit establishedironi buttery connected tothe sleeve contacts oi' plus' 7, and jack 3 through the windings14 and 10 otlrelays 15 and 9u, respectively, in seriessand the winding; 8 oi relay 9 through the sleeve Conductor or" the trunk circuit B. the sleeve contacts oitjack 2 and plug 107. the normal contact oi' relay 111,2, .the wind ingr ot relay 113, and the lower alternate contacterC relay 111 to ground. The operation o1 relay 113 opens the Circuit oigand prevents the Complete operation or relay 112. Under these conditions 'the current 111 and 16 of dii- ;Cerential relay 15 causes the operation oi such relay, whereupon disconnect signal lamp 18 is lighted over a circuit extending from battery through the Contact of relay 15 and lamp 18 to ground, thereby indicating` that the responsibility oli the call has been assumed vby the operator at position Y.

The operator moves the plug` 7 `from the jack', opening` the operating circuit of relay 9, wher upon a circuit is established from battery ythrough winding,` 8 otr/slay' 9*,.the lei-'bhandalter nate Contact 'oi'A relay 2,'winding19 oifrelay 9v to the'inid point between windingsll'and 16 ofrelay lywhere it joins' the circuit previously traced for windings 14C and 16. Relay 9 releases inthis circuit, the release bein?,` assisted yby the reversal ot current in winding 10. Relays 11.. 12 release, extinguishing the lamp 1S andre storing' all apparatus of' link eireuit D yto normal. The winding of marginal relay 113 oi" link Circuit D, isthereuponincluded in a circuit extending` Jfrom battery through winding 108er relay 109, the left-hand norinaloontaot or" relay 112, the windingV ot re` lay .113,*and the lower alternate Contact of relay 111 to ground. but the amount oit cur-l rent flowing through such Circuit is insuiiicient to maintain relay 113 operated. @In releasing its arma-ture, relay 113 causes vthe operation of relay 112 over a circuit estab` lished troni battery through the winding of rela 112. the Vcontactorela i and con Q.

tact 117 of relay 111 to ground, thereby .placing` the 'apparatus of link circuit D Aiu and 15y thereupon at position Z'thereupon re lilo the saine condi'ion as thatof the similar apparatus of link oirouit 1) existing' upon the insertion of plug?v into jack 3. Y As in the oaseo link circuit D the actuation 'oit listen-- ings; key 119 `connects the operators telephone set (not shown) at positionl7 with the line circuit A. through the link circuit D', and the trunk circuit B. After obtaining Ithe re" CIT CIK

quired information the operator at position Y notifies the connect-ing operator at position X, over a call circuit or in some other suitable manner, and the latter operator proceeds to complete the connecticnirom the trunk circuit B to the called line. ln' establishing this connection, the insertion ot the answering plug 5 of link circuit C into jack 1 of the trunk circuit Bcompletes a circuit extending trom battery through resistance 6, sleeve contacts of plug 5fand jack 1 to the sleeve conductor ot trunk circuit B, whereit joins the circuits previously traced as being connected with such vsleeve conductor through the sleeve contacts of plug 107 and jack '2. Under 'these conditions the `cur`y rent flowing through the differentially connected 4,windings 114 and 116 causes the operation of' relay 115 and `the consequent lighting of lamp 118 over a circuit extending from `battery through the contact of relay 115, and thelama 118 tov ground. The operator at position observing the illumination of lamp 118, removes the plug 107 from jack 2, whereupon, in a manner similar to that described in connection with the removal of plug 7 from jack 3, the operating circuit of relay 109 is opened, the windings 108 and 110 are placed in opposing relation in a local circuit, thereby causing the release ot' such relay and the consequent restoration to normal. oi' all apparatus oit' link circuit D.

It will thus be evident from the above description that by means of this system a positive disconnect indication is given to each operator upon the assumption of the responsibility for the call by the succeeding operator, and that the complete and immediate restoration to normal ot all apparatus in the link circuit is insured upon the disconnection of the link circuit.

What is claimed is:

1. vA telephone exchange system comprising a trunk line circuit, an operators link circuit Jor connection therewith, a relay in such link circuit having a plurality of windings and operated through one winding upon the connection ot the link circuit with the trunk circuit, and means tor connecting such windings in magnetically aiding relationship upon such connection to maintain the relay operated, and for connecting such windings in another circuit upon the disconnection of the link circuit from the trunk circuit to release the relay, the windings being connected in magnetically opposing relationshipl 2. A telephone exchange system comprising a trunk line circuit, an operators link circuit for connection therewith, a relay having a plurality oi windings and operated through one winding upon the connection of the link circuit with the trunk circuit, and means controlled by such conlease of the relay, 'the windings being con.-

nected in magnetically opposing relationship.

3. A telephone exchange system comprising atrunk line circuit, an cperators link 7circuit for yconnection therewith, a relay f having a plurality oi' windings and operated through onewvinclinn' upon the connection O L .J

or the link circuit with the trunk circuit, a

circuit therefor for maintaining the relay 1n an operated condition' established upon and controlled by the connection ot the link circuitwith the trunkcircuit, and

including certain vot such windings connectedv in magnetically aiding relationship, and Ia releasing circuit for the relay completed upon the opening ot the operating circuit and including the Ysame windings connected in magnetically opposing relationship.

d. A telephone erichange'system comprising a trunk line circuit; an operators link circuit for connection therewith; a relay having a plurality of windings; an operating `circuit therefor, completed upon Ithe connection oi the link circuit with the trunk circuit, and including one oi such windings and conductors oit the trunk and link circuits; a maintaining circuit tor such relay, subsequently completed during such connection, including another of s'uch windings connected in magnetically aiding relationship with the rst mentioned winding; and a releasing circuit for `the relay established upon-thc disconnection oit the link circuit from the trunk circuit independent of the conductors of such trunk and link circuits, and including the above mentioned two windings connected in magnetically opposing relationship.

5. A telephone exchange system comprising a trunk line circuitn an operatoi"s link circuit for connection therewith, a relay having a plurality of windings and operated through one winding upon the connectionV of the link circuit with the trunk circuit, a circuit tor maintaining such relay operated completed during the connection of the trunk and the link circuits includ-- ing two such windings and means for connecting such windings in another circuit to release the relay, the direction ot current flowing through one of such windings being reversed upon the disconnection ci the link from the trunk.

6. A telephone exchange system .comprising a trunk line circuit, a plurality osimilar` operators link circuits for connection to said trunk circuit, a relay in each link circuit with a luralit ofwindings-'ineensfor connecting the Windingsfo said relay in magnetically opposing relationship upon the connection of its ass eiated link circuity with the trunk circuit rvto prevent its opera-v tion under this condition7 and ineans for changing the relative current iiow 4inthe windings to Cause the operation o said relay upon the connection of the second link Circuit With the trunk circuit. i

7. A telephone exchange system compris-Y ing a trunk line yo1rcint,a plurality of snni# lar operators link circuits for connection to said trunk circuit, a marginal relaj'y `in5 each link circuit, means for preventing rvthe its subsequent operationfwhena second one of said plnralityvof link circuits is connected to the tru-nk circuit, and means, for causf with, a relayl having a `pluraiity of' Wind- WhenU its" associated link oircnit is the sec-i 10nd of :said linkyicircuits lto be connected with vsaid .trunk circuit.`

ingI 'the operation `vof .said Y ymarginali` relay l t 8. Ina teleph vne exchangesystemla trunk circuit,` a link .circuit for connection there-A ingsandoperated throughone of the windingsfupon the-connection of the. link circuitwith :the Atrunk rcircuit, and means .rey sp'onsive tov such .connection for: connecting-'fs another i of ":the windings in Y magnetically l aiding relationship ,with theiirst .mentioned Windinuto assist'in maintaining:the-relay y .operatedand effective npon the disconnection 'of the4 linkfcircuit vfromthe trunk 'cir cult to release thereby. y v

In Witness whereof, I :hereuntosubscribe my. name, this fQLthfdayof fDeeeinloen 'WiLLmMtefWniWnR 

